<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>Title</title>
</head>
<body>
    <a href="/day15/img/1.png">图片1</a>
    <a href="/day15/img/2.png">图片2</a>
    <hr />

    <a href="/day15/downloadServlet?filename=1.png">图片1</a>
    <a href="/day15/downloadServlet?filename=2.png">图片2</a>
</body>
</html>